III International Conference

PP-III-83THE RING CATALYST WITH LOW HYDRAULIC RESISTANCESoldatov I.V., Karalin Eh.A., Ksenofontov D.V., Pavlov A.S., Kharlampidi Kh.Eh.The Kazan state technological university, Kazan, RussiaE-mail: isoldatov@mail.ruComparative experiments by definition of size of hydraulic resistance of granular bed ofring-shaped thick-walled pellets of various diameter are executed. It is shown, that the resultsof calculation of hydraulic resistance have satisfactory convergence with experiment in thecase when factors of resistance of granular bed for the particles of the cylindrical or irregularform were used.For fixed-bed catalytic reactors the major characteristic is the hydraulic resistance whichis determined by the form of pellets and its sizes. The industrial samples of gamma-aluminumoxide produced hitherto in Russia (as the most commonly used catalyst carrier) weregranulated in the form of spheres or cylinders, however the bed of such pellets ischaracterized by high hydraulic resistance. Recently the industrial company "Catalyst"(Novosibirsk) started the production of the ring-shaped thick-walled extrudates based ongamma-aluminum oxide with the size less than 10 mm (technical specifications 6-68-146-02).We have measured the hydraulic resistance of series of industrial samples of ringextrudates with external diameter from 6.6 up to 8.4 mm (the basic characteristics arepresented in table 1). Hydraulic tests were performed on a wind tunnel with the diameter of45 mm (mobile phase - air, ambient temperature, volume of loading of pellets 1 dm 3 ).Table 1 - Characteristics of the tested samplesIndexDimensionThe Sample1 2 3External diameter mm 8.4 7.4 6.6Internal diameter mm 3.2 2.8 2.5Height mm 7.7 7.7 7.2Splitting strength kg/pellet 16.1 ± 0.8Specific surface m 2 /g 160 ± 10In figure 1 experimental data on hydraulic resistance of ring extrudates, cylindricalextrudates of gamma-aluminum oxide АОА-type with the diameter (4.35 ± 0.05) mm(GOST 8136-85), spherical pellets an alpha-aluminum oxide with the diameter (5 ± 0.5) mmare presented.626